Control of the Northern Fowl Mite, Ornithonyssus sylviarum (C. & F.), with Ronnel, Bayer L13/59 and Bayer 21/19912

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Abstract
Five hundred ninety-four hens and 100 roosters were used to test three organic phosphorous insecticides for control of the northern fowl mite, Ornithonyssus sylviarum (C & F.). Bayer 21/199 (O-(3-chloro-4-methylumbelliferone, O, O-diethyl thiophosphate) as 0.5 and 0.25% dusts and Bayer L13/59 (O, O- dimethyl-2,2,2-trichloro-1-hydrdxyethylphosphonate) and ronnel as 1% dusts were applied to individual birds on four body areas at the rate of 3 to 4 grams per bird. Each gave satisfactory control up to 28 days after treatment and apparently anyone of the insecticides would virtually eradicate the mites if no birds were left untreated. No detectable residue could be found in the eggs of hens treated with Bayer 21/199 or ronnel and no off-flavor of eggs was detected.

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